SPA 4302 Lecture 7: Clinical Masking
14 Feb 2019
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Interaural attenuation and cross hearing : when is masking needed, bc testing, bone oscillator vibrates the whole skull. If nte has a better sensitivity than the te, the patient will respond, but it does not represent the te. At moderate or higher intensities, the stimuli (depending on transducer type) can also cause skull vibration, giving an opportunity for the nte to respond. Interaural attenuation (ia: the difference level between what is presented to the te and what the. If this occurs, then you lose test reliability. Ac ia (insert earphones) = 55 db: cross hearing, when a stimulus is delivered to the te and it is heard by the nte, that is cross hearing. Almost always occurs by bc: whenever the nte can hear by bc, masking is needed. Ac = mask 40 db for supra-aural, 55 for insert greater than the bc signal for the nte.
